Harley Engine
Harley Bike Engine Parts at JJ Motorsports
Rebuild and boost your Harley's engine with premium parts from JJ Motorsports. Our inventory features complete gasket sets, piston kits, oil filters, pushrod tubes, and coolers designed for maximum strength, leak-free sealing, and high-performance in extreme conditions. Compatible with Big Twins, Softail, Touring, and more, these components support top-end overhauls, oil management, and durability for street rides or custom builds.
Shop trusted brands like Drag Specialties for magnetic filters and Wiseco for forged pistons. Explore related categories such as Harley air and fuel for carb tuning or Harley drivetrain for transmission upgrades.
Top Harley Engine Products
- DRAG SPECIALTIES Magnetic Ring Oil Filter - Chrome - 3-1/4" 140003HP-BX18 – Captures metal particles with pressure relief.
- WISECO Piston Kit .010 .883 XL K1656 – Forged aluminum with rings, pins, and circlips for rebuilds.
- DRAG SPECIALTIES Pushrod Tube Kit Big Twin 75711 – Includes tubes, clips, cups, and springs for complete engine.
- ULTRACOOL Below Regulator Mount Oil Cooler Stainless Steel RF-2CSS – Fits S&S 111/124/143 engines with machined adapter.
- PAUGHCO Ribbed Teardrop Air Cleaner 701-200 – Chrome-plated aluminum with mini filter.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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REVOLUTION PERFORMANCE, LLC Piston Kit RP301-104W
REVOLUTION PERFORMANCE, LLC
$495.95When you're pushing your engine to the limit, stock pistons become your weakest link. The Revolution Performance RP301-104W piston kit delivers the strength and thermal stability required for sustained high-RPM operation, engineered with custom-forged...09106370- SKU:
- 09106370
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4'
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.937'
- DISPLACEMENT:
- 98'
- COMPRESSION RATIO IMPERIAL:
- 10.3:1
$495.95 -
REVOLUTION PERFORMANCE, LLC Piston Kit RP301-105W
REVOLUTION PERFORMANCE, LLC
$495.95High-performance pistons demand precision engineering and material science to withstand extreme combustion pressures and thermal cycling. The REVOLUTION PERFORMANCE RP301-105W piston kit delivers custom-forged construction with a skirt coating and offset...09106371- SKU:
- 09106371
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- BORE SIZE IMPERIAL:
- 3.937'
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- PISTON HEAD SHAPE:
- FLAT TOP
- STROKE LENGTH IMPERIAL:
- 4'
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 98'
- UNITS:
- KIT
$495.95 -
EMGO Crankcase Filter Kit 14-20910
EMGO
$10.60High-quality crankcase breathers and filters from Emgo1420910- SKU:
- 1420910
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- FEATURES:
- RUBBER-TOP
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
- PRODUCT NAME:
- VENT FILTER
$10.60 -
EMGO Replacement Filter - Chrome 14-20905
EMGO
$11.94For use only with crankcase vent filter1420905- SKU:
- 1420905
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- FILTER
- UNITS:
- EACH
$11.94 -
EMGO Crankcase Filter Kit 14-20900
EMGO
$22.40High-quality crankcase breathers and filters from Emgo1420900- SKU:
- 1420900
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
- FEATURES:
- WITH CHROME BASE
- PRODUCT NAME:
- VENT FILTER
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
$22.40 -
EMGO Oil Filter - Chrome 10-82442
EMGO
$16.50A quality oil filter is fundamental to engine longevity—it removes contaminants that would otherwise accelerate wear on critical internal components. The EMGO Chrome 10-82442 uses premium materials and robust construction to ensure consistent filtration...1082440- SKU:
- 1082440
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- BASE COLOR:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- UNITS:
- EACH
$16.50 -
EMGO Oil Filter - Chrome 10-82400
EMGO
$12.04A quality oil filter is foundational to engine longevity—it removes contaminants that accelerate wear on critical internal components. The EMGO Chrome 10-82400 uses premium paper, metal, and rubber construction bonded with high-strength epoxy to deliver...1082400- SKU:
- 1082400
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- CHROME
- BASE COLOR:
- SILVER
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
$12.04 -
EMGO Drop-In Oil Filter with Seals 10-28300
EMGO
$7.23An oil filter is one of the most cost-effective maintenance items you can invest in—and it directly impacts engine longevity and performance. The EMGO Drop-In Oil Filter (10-28300) uses premium-grade materials and robust epoxy bonding to deliver...1028300- SKU:
- 1028300
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- SILVER
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
- TYPE:
- DROP-IN
- RIDING STYLE:
- STREET
$7.23 -
EMGO Oil Filter - Chrome 10-07800
EMGO
$12.04An engine's lifespan depends entirely on oil quality, and that starts with filtration. The EMGO Oil Filter 10-07800 uses multi-layer paper media and reinforced epoxy-bonded construction to trap contaminants while maintaining optimal flow rates, keeping...1007800- SKU:
- 1007800
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- BASE COLOR:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- CHROME
$12.04 -
EMGO Oil Filter - Black 10-07700
EMGO
$8.31A quality oil filter is fundamental to engine longevity—it directly impacts how well your engine stays protected from contaminants that accelerate wear. The EMGO 10-07700 uses premium filtration media and robust construction to maintain consistent oil...1007700- SKU:
- 1007700
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- BASE COLOR:
- BLACK
- FILTER MEDIA MATERIAL:
- PAPER
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
$8.31 -
EMGO Oil filter 10-28310
EMGO
$6.53An engine is only as clean as its oil filter. The EMGO 10-28310 uses premium filtration media and robust construction to keep contaminants out of your oil system, directly extending engine life and maintaining peak performance. Whether you're running...07120409- SKU:
- 07120409
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- COLOR/FINISH:
- SILVER
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- DROP-IN
- COLOR/FINISH:
- ORANGE
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- RIDING STYLE:
- STREET
$6.53 -
COMETIC Head Gasket - 4"- .040" C9880
COMETIC
$61.90A head gasket failure can sideline your engine and drain your wallet—this is where precision engineering becomes non-negotiable. The COMETIC C9880 uses Multi-Layer Steel (MLS) construction with Load Control Embossments to distribute clamping force evenly...09340010- SKU:
- 09340010
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
$61.90 -
COMETIC Head Gasket - SSW - +4.125" - .027" C9930
COMETIC
$61.90A head gasket is your engine's first line of defense against combustion blow-by and coolant leakage—and compromising on quality here invites catastrophic failure. The COMETIC SSW Head Gasket is engineered to withstand extreme pressures and temperatures...09340031- SKU:
- 09340031
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.69 MM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,69 MM (0,027')
- THICKNESS IMPERIAL:
- 0,027'
- UNITS:
- PAIR
$61.90 -
COMETIC Head Gasket SSW+4.125.030 C9931
COMETIC
$61.90A head gasket failure can cost you race time and credibility on the track. The COMETIC SSW+4.125.030 delivers the seal integrity and thermal stability you need to keep combustion pressure where it belongs—inside the cylinder. Built from premium...09340032- SKU:
- 09340032
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
$61.90 -
COMETIC Head Gasket - SSW - +4.125" - .036" C9932
COMETIC
$61.90A head gasket is the critical seal between your engine block and cylinder head—any compromise in material quality directly impacts combustion efficiency, coolant integrity, and overall engine reliability. The COMETIC SSW head gasket is engineered from...09340033- SKU:
- 09340033
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,91 MM (0,036')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
$61.90 -
COMETIC Head Gasket - SSW - +4.125" - .040" C9933
COMETIC
$61.90A head gasket failure can end your race day or sideline your project build indefinitely. The COMETIC SSW Head Gasket delivers the sealing reliability required for high-boost and high-rpm applications, engineered to resist fuel degradation, thermal...09340034- SKU:
- 09340034
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,125'
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
$61.90 -
COMETIC Base Gasket - +4.125" - .020" C9936
COMETIC
$33.55A precision base gasket is critical to maintaining boost pressure integrity and preventing coolant/oil seepage in high-performance applications. The COMETIC C9936 combines a stainless steel core with dual Viton rubber coatings to deliver the reliability...09340036- SKU:
- 09340036
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
$33.55 -
COMETIC Oil Pan Gasket - M8 C10243
COMETIC
$22.00A leaking oil pan gasket compromises engine lubrication and creates mess under your bay—neither acceptable for serious racers or meticulous builders. The COMETIC M8 C10243 delivers a complete gasket solution engineered specifically for your application,...09346335- SKU:
- 09346335
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PAN
$22.00 -
COMETIC Trans Top Cover Gasket - M8 C10246
COMETIC
$25.15A leaking transmission top cover gasket compromises hydraulic integrity and invites contamination into your gearbox—exactly what you don't need mid-race or mid-project. The COMETIC Trans Top Cover Gasket delivers a complete, application-specific seal kit...09346336- SKU:
- 09346336
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
$25.15 -
COMETIC Breather Gasket Kit - Twin Cam C10161
COMETIC
$20.95A breather system that weeps oil or allows blow-by gases to escape is a sign of worn gaskets and seals—problems that compound quickly under boost or high RPM operation. The COMETIC Breather Gasket Kit gives you everything needed for a complete, leak-free...09346002- SKU:
- 09346002
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- BREATHER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$20.95
